Hydrangea leaves turning black
Today, I will explain in detail the experience of plant maintenance regarding hydrangea leaves turning black for netizens. Next, the editor of the website will introduce to the netizens.
Hydrangea leaves turning black
The blackening of hydrangea leaves may be caused by factors such as积水 in the potting soil, improper fertilization, prolonged exposure to strong sunlight, and pest and disease attacks. To prevent the leaves from turning black during the maintenance process, it is necessary to water reasonably, keep the soil moist, fertilize appropriately, and apply thin and frequent fertilization. In summer, avoid direct sunlight and maintain a ventilated environment to prevent the occurrence of pests and diseases.
When watering hydrangeas in large amounts for a long time, the accumulation of water in the potting soil can lead to blackening of the leaves. Therefore, it is essential to water appropriately each time, following the principle of watering when the soil is dry and wet. During the growing period, water frequently to keep the potting soil slightly moist.
When fertilizing, too little or too much fertilizer can cause the leaves to turn black. Therefore, it is necessary to fertilize reasonably. For example, during the growing period, apply a mature liquid fertilizer every half month, add phosphorus and potassium fertilizers once a month during the bud stage, and apply a foliar spray of potassium dihydrogen phosphate once.
When hydrangeas are exposed to strong sunlight for a long time, it can cause the leaves to turn black. Therefore, it is best to shade them in summer to prevent direct sunlight, placing them in a semi-shaded light environment. In other seasons, normal sunlight exposure can promote lush leaf growth.
Hydrangeas often suffer from various pests and diseases during growth, such as aphids, red spiders, and powdery mildew, which can cause the leaves to turn black. It is necessary to spray with pesticides in a timely manner. A 40% omethoate emulsion can be diluted 1500 times for spraying, and diseases can be treated with a 40% carbendazim-thiram suspension diluted 500-600 times for spraying.
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